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—Delay Tolerant Networking (DTN) enables transfer of data where conventional network protocols fail to deliver data because no continuous end-to-end connectivity is available. While the Bundle Protocol (BP) has been established as the standard DTN protocol in many application areas, Wireless Sensor Networks (WSN) often use proprietary protocols with a(More)
Context prediction is the task of inferring information about the progression of an observed context time series based on its previous behaviour. Prediction methods can be applied at several abstraction levels in the context processing chain. In a theoretical analysis as well as by means of experiments we show that the nature of the input data, the quality(More)
This paper researches the potential of a novel ball switch as a wearable vibration sensor for activity recognition. The ball switch is available as a commercial, off-the-shelf sensor and is unique among such sensors due to its minia-turized design and the low mass of the ball. We present a detailed analysis of the physical properties of the sensor as well(More)
—The overall goal of GINSENG is a wireless sensor network that will meet application-specific performance targets, and that will be proven in a real industry setting where performance is critical. This demonstrator shows some of the key outcomes of the GINSENG project such as energy-efficient wireless real-time closed loop control, performance debugging,(More)
Being able to determine the location of a node is of great advantage in many IoT and WSN applications. For example, in health care scenarios or for autonomous configuration of IoT setups this information can be useful. One of the key challenges in localization is to estimate the distance between nodes. Most present indoor localization systems require(More)
—Wireless Sensor Networkss (WSNs) nowadays are deployed in miscellaneous fields of application. Some use cases – especially those which include mobility – would benefit from a communication protocol that handles connection losses by design instead of assuming a continuous end-to-end connection. In this work, we describe the implementation of a Delay(More)
Wireless sensor networks consisting of a large number of relatively inexpensive nodes are used in a variety of tasks. When being used in difficult to access terrain, or dangerous surroundings, such as often encountered in disaster scenarios , the deployment of a WSN becomes a challenge. In this paper we introduce a novel approach for deploying a WSN: We(More)
Wireless sensor networks operate in open environments with potentially rough conditions. The utilised protocols to implement routing decisions in such networks are typically designed to work under challenging external influences. In this paper, we focus on the most popular representative, the Routing Protocol for Low Power and Lossy Networks (RPL), and(More)